Hey. GT uses the same principle of spaced repetition. I think they offer a quality product, and people are reporting really good performance if you keep up. I think if you don't want to make your own cards, and you're willing to pay for access, it's a great resource. I use Anki because it's free, has more features, has a mobile app, and I can add my won stuff and own it. But the principle is the same - spaced repetition rather than massed cramming. If you read some of the other articles I linked to, you'll see that there is over a century's worth of research studying and confirming the spacing effect. It's an amazing thing that that insight has not really penetrated pedagogy and learning practices more broadly. We still do stuff that makes no sense, like making elaborate note sheets or outlines, use them for a test, then shove them away under the bed, never to be seen again. For all the money and time we spend trying to become doctors, shouldn't we have some durable assets to take away from this? Otherwise, everything we're doing is just some bizarre academic exercise with little long-term benefit.